-LRB- CNN -RRB- -- Twenty tourists , including two Americans , are stuck on a chunk of ice drifting in the Canadian Arctic , Canadian officials said Tuesday .

The group was on an expedition in the Canadian territory of Nunavut when the ice that they were on broke away from shore , according to Yvonne Niego of the Royal Canadian Mounted Police . The ice floe has since drifted about 2 miles , the Canadian Coast Guard said .

No one was hurt , nor are the tourists in any imminent danger , according to Major Steve Neta of the Royal Canadian Air Force , which is assisting in the rescue .

But , he said , the ice floe is beginning to show signs of deterioration .

A rescue mission is currently under way , but the location is so extreme that helicopters wo n't arrive until at least Wednesday morning , according to the Canadian Coast Guard .

Survival kits were dropped Tuesday from airplanes to the floating refugees , whose names have not been released . It 's currently about 35 degrees Fahrenheit where they are .

The tour company , Canadian-based Arctic Kingdom Polar Expeditions , declined to comment when reached by CNN Tuesday night .

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20 tourists are trapped on chunk of ice in the Canadian Arctic

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The floe has floated about 2 miles from shore , Coast Guard says

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Rescue helicopters expected to arrive Wednesday morning , officials say

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The group , including two Americans , received air-dropped survival kits